[Bug tapsets/15219] syscall.exp failures on RHEL5, RHEL6, and rawhide

["dsmith at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=15219

David Smith <dsmith at redhat dot com> changed:

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--- Comment #9 from David Smith <dsmith at redhat dot com> ---
Created attachment 7166
  --> https://sourceware.org/bugzilla/attachment.cgi?id=7166&action=edit
anti-nested syscall patch 2

Here's yet another approach to fixing this one. This one attempts to solve the
nested-syscall problem by defining 2 macros: '@__syscall_enter' (called at each
syscall entry probe) and '@__syscall_exit' (called in each syscall return
probe). It just uses a global array to figure out if we're already in a system
call in this thread. If so, the probe is skipped.

Here are some notes:

- I just modified the syscall tapset enough to get the 32-bit clock syscall
passing, I didn't modify every place that needs changes.

-There are a couple of problems with using a macro library file, listed there.
The best way of fixing these problems might be to combine syscalls.stp and
syscalls2.stp so that the macros could be defined in that file.

- Similar changes would need to be made for the nd_syscall tapset. It would
probably need its own global array.

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